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PUBLICTIEALTH SERVICES <br /> SAN JOAQUIN COUNTY WY <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D.,M.P.H., Health Officers• �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 F I L E U""I <br /> JOHN & MARGARET MARCI <br /> MARCIS DIESEL SERVICE DEC 10 1998 <br /> 2973 LOOMIS ROAD <br /> STOCKTON CA 95205 <br /> RE: 2969 Loomis Road SITE CODE: 2015 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Work Plan For Placing Two (2) Soil <br /> Barings/Groundwater Monitoring Wells" dated December, 1998, prepared by <br /> William J. Hunter & Associates for the above referenced site. <br /> The work plan states that soil sampling will begin at 20 feet below surface grade <br /> (bsg). Soil contamination was confirmed at 15 feet bsg in previous <br /> investigations. In order to define the soil contamination laterally, soil sampling <br /> should begin at 15 feet below surface grade. In addition, the well completion <br /> schematic indicates the total depth of the boring to be 75 feet. The drilling <br /> should continue below 80 feet bsg since soil contamination was evidenced at 80 <br /> feet bsg in both LB1 and MW4. The vertical extent of the contamination must be <br /> confirmed. <br /> The monitoring well screens must intercept the first water encountered below <br /> grade (which was about 59.4 feet bsg in July 1998). Monitoring well screens <br /> should be limited to 20 feet in length. If contamination extends beyond 80 feet <br /> bsg, two casings should be installed in the borehole. One casing should be <br /> screened to monitor deep groundwater and the second casing should be <br /> screened to monitor first groundwater. The well completion schematic in the <br /> work plan shows a 6 inch hollow auger boring. The borings should be drilled <br /> with 8-inch hollow stem augers. <br /> The proposed placements of MW5 and MW6 are 70 to 80 feet away from the <br /> former underground storage tank (UST) locations. Monitoring well 5 should be <br /> placed within 40 feet of the former UST locations. If MW5 appears <br /> contaminated, MW6 can be placed further than 40 feet from the former UST <br /> locations. <br /> A Division of San Joaquin County Health Care Services <br />